Lawn mower



Aug. 24, 1937. H. c. LIMBACH LAWN MOWER Filed July 12; 1934 7 Sheets-Sheet l INVENTOR.

A TTORNEYS.

Aug. 24, 1937.

' H. C. LIMBACH LAWN MOWER Filed July 12, 1934 7 Sheets-Sheet 2 INVENTOR:

\ HenryCZzwkmc-k H. C. LIMBACH Aug. 24, 1 93 7.

LAWN MOWER Filed July 12, 1954 7 Sheets-Sheet 3 INVENTOR. Her? ry 6'1 Zim4k ATTORNEYS.

Aug. 24, 1937. H. c. LIMBACH LAWN MOWER Filed July 12 1934 '7 Sheets-Sheet 4 INVENTOR. Henry C Zz'm fiaces/W,

ATTORNEY5.

Aug. 24, 1931. H. c. LIMBACH 2,091 077 LAWN MOWER Filec 1 July 12, 1954 I 7 Sheets-Sheet 5 INVENTOR. E- l Henry C lz'wfiaa/k MAM gwyM.

A TTORNEYS Aug. 24, 1937.

LAWN MOWER Filed July 12, 1934 7 Sheets-Sheet 6 m a C. m. e H

A TTORNEYS.

Aug. 24, 1 937.

LAWN MOWER H. C. LIMBACH Filed July 12, 1954 7 Sheets-Sheet 7 INVENTOR. flerrrjy C Zilrriac/r.

A TTORNE-YS.

Patented Aug. 2 4, 1937 UNITED STATES PA'IQENT OFFICE LAWN MOWER tion of Michigan Application July 12, 1934, Serial No. 734,769

44 Claims.

This invention relates to lawn mowers and has for its principal object the provision of a lawn mower of improved operating and wearing characteristics, and of added usefulness as compared to conventional constructions.

Objects of the invention include the provision .of a lawn mower in which the line of contact between the cutter blades and the cutter bar is in approximate vertical alignment with the axis of the driving wheels and consequently with the line of contact between the driving wheels and the surface upon which the lawn mower is supported; the provision of a construction as above described in which the cutter and cutter bar assembly is shiftable in a vertical direction to vary the height of cut thereby without materially afiecting the approximately vertically aligned relation between the cutting edge of the cutter bar and the line of contact of the wheel and the ground; the provision of a lawn mower having driving wheels and a supporting roller including a chassis frame pivotally mounted with respect to the axis of the roller and carrying the cutter reel and bar, the wheels being independently pivotally mounted with respect to the axis of the roller and being separately adjustable relative thereto without afiecting their driving connection with the cutter reel; the provision of a construction as above described in which one of the driving wheels may be removed or may be adjusted independently of the other wheel without materially affecting the cutting ability of the lawn mower; the provision of a. lawn mower 'in which the cutter reel and wheels are bodily shiftable relative to one another to vary the heightof cut including a novel form of driving mechanism interconnecting the wheels and cutter reel to permit such bodily shifting of the reel with respect to the wheels without affecting the driving connection between them; and the provision of a novel lawn mower construction permitting vertical bodily shiftable movement of the cutter reel and cutter bar assembly with respect to the driving wheel without affecting the driving relation between them, and means for easily and quickly locking the parts in their adjusted positions.

Other objects of the invention include the provision of a lawn mower having a cutter reel and cutter bar and means for causing relative movement between the cutter reel and cutter bar during operation of the lawn mowerin a direction axially of the cutter reel 'whereby to obtain a more perfect cutting action thereby and whereby to obtain a. self-sharpening action between the blades of the cutter reel and the cutter bar; and

the provision of a' lawn mower having a. cutterreel provided with an annular cam associated with one end thereof, the cutting action of the mower constantly urging said cutter reel axially 'in a direction opposed to the direction of actuation of the cam means.

Other objects of. the invention include the provision of a lawn mower having a novel form of mechanism for adjusting and locking the cutter bar in place; the provision of a lawn mower having a single means of adjustably moving the entire cutter bar with respect to the cutter reel; the provision of a lawn mower having a pivotally mounted cutter bar and a plurality of arms longitudinally spaced with respect thereto, cam means associated with each of .the arms and a. common means for simultaneously adjusting the cam means with respect to the arms; and the provision of a simple and efiective locking means for locking the above mentioned cams in their adjusted position.

Other objects of the present invention include the provision of a lawn mower having a novel form of chassis construction; the provision of a lawn mower having a chassis bodily shiftable independently of the driving wheels, and having a novel form of means for connecting the chassis v and driving wheels, and the provision of a lawn mower having a relatively short and constant. wheel base.

Other objects include the provision of a lawnmower having a novel form of chain drive between the driving wheels and the cutter reel; and the provision of a lawn mower including a chassis and driving wheels bodily movable rela- 1 tive to one another about an axis eccentric to the axes of both, the wheels and cutter reel being provided with axially concentric sprockets each connected by a chain to a sprocket mounted concentrically with respect to said eccentric axis.

Other objects are the provision of a novel form of cutter reel for lawn mowers; and the provision of a lawn mower provided with a'cutter reel and a shaft for driving the cutter reel, the shaft and cutter reel being independently rotatably supported upon the side frame members of said mower.

Other objects of the invention include the provision of a lawn mower provided with a handle so constructed and arranged as to permit the 50 handle to be moved so as to position its center of gravity forwardly of its axis of mounting when not in use and thereby to automatically retain it in such position.

Other objects are to provide a lawn mower having a replaceable wheel tread; the provision of a lawn mower driving wheel construction of novel design; the provisionof a novel connection between the driving wheel and the cutter reel of a lawn mower including a novel form of overrunning clutch mechanism; the provision of a novel guard means for cutter reel of a lawn mower; the provision of a cutterbar for a lawn mower in which the cutting edge is formed of a special material highly resistant to wear; the provision of a lawn inower cutter bar of novel construction; the provision of a novel means for shielding the ends of a cutter reel from becoming wrapped by long grass; and the provision of a .15 lawn mower structure in which the driving wheels are positioned to the rear of the cutter bar and usual roller and provided with a novel form of drive to the cutter reel.-

The above being among the objects of the present invention, the same consists in certain novel features of construction and combinations of parts tov be hereinafter described with refer- .ence to the accompanying drawings, and then claimed, having the above and other objects in view.

In the accompanying drawings which illustrate suitable embodiments of the present inventionand in which like numerals refer to like parts throughout the several different views,

Fig. 1 is a perspective front quarter view of my improved lawn mower.

Fig. 2 is an enlarged vertical sectional view taken transversely through the axis of the lawn mower as on the line 2-2 ofFig. 1.

Fig. 3 is a partially broken, partially sectioned view of the lawn mower on thesame scale as in Fig. 2 looking from the realthereof as on the line 33 of Fig. 2.

Fig. 4 is a partially broken, partially sectioned plan view of the lawn mower taken on the line 4-4 of Fig. 3.

Fig. 5 is an enlarged partially sectioned view taken on the line 5-5 of Fig. 3 andillustrating in greater detail the construction employed for 'adjustably locking the chassis and wheel mechanism together.

Fig. 6 is an enlarged, fragmentary, sectional view taken on the line 6-6 of Fig. 3.

Fig. 7 is a partially broken, vertical sectional view taken on the line of Fig. 3.

Fig. 8 is a vertical sectional view taken on the line 8-8 of Fig. 3. a

Fig. 9 'is a transverse sectional view taken axially through one of the driving wheels as on the v line 99 of Fig. 7.

Fig. 10 is a vertical sectional view taken axially through a modified form of driving wheel construction.

. Fig. 11 is a fragmentary sectional view taken centrallythi'ough a. modified form of cutter bar construction and illustrating the manner of supporting an end of the same in one of the chassis side' frame members. 7 i I Fig. 12 is a fragmentary-plan view of the construction shown in- Fig. 11, taken as on-the line [2-12 of 11.

Fig. 13 is a fragmentary view showing a modifled form of construction by means of which both driving wheels maybe simultaneously adjusted with respect to the chassis assembly and locked in such adjusted position.

Fig.1! is a sectional view taken on the line "-44 of Fig. 13.

Fig. 15 is apartially brokenside elevational view of a modified form of construction partic ularly intended for use on putting greens of bent grass or for similaruses.

Fig. 16 is a partially broken, enlarged top plan view of the construction shown in Fig. 15.

Fig. 17-is a fragmentary, partially broken sectional view taken axially through a modified form of cutter reel and shaft construction showing a modified manner of mounting the same.

Fig. 18 is a side view of a modified form of construction employing a chain drive.

Fig. 19 is a fragmentary partially broken sectional view taken on the line l9l9 of Fig. 18.

The present invention involves a lawn mower structure in which the cutter reel is adjustable relative to the axes of the driving wheels and an important feature of the invention is the provision of a lawn mower involving a supporting rollerwhich, according to the present invention, is employed as a fulcrum roll about the axis of which the driving wheels and the cutter reel are adjustdriving wheels themsdves are secured relative to the axis of the fulcrum roll so that in effect the chassis and the driving wheels are angularly movable with respect to each other about the axis of the fulcrum roll. A novel form of driving mechanism is provided between the driving wheels and the cutter reel permitting adjustment between these parts without affecting the oper ability of the drive in any respect whatever;

Various other features of novelty are incorporated in the preferred form of structure but these will be brought out in detail in the following description.

Referring now to the accompanying drawings and particularly to Fig. 3, it will be noted that the fulcrum roll is preferably made up of one or morerollers 20 suitably mounted upon a shaft .22. In the present instance the rollers 20 are shown as formed of sheet metal and provided with central inwardly directed sleeves 2l at their opposite ends in each of which is received a. suitable bushing 26 for rotatably receiving the shaft 22. Where more than one roller 20 is employed-as in the embodiment shown, a spacer 2B is preferably provided on the shaft 22 between adjacent ends of adjacent rollers 2. so as' to maintain them in suitably spaced and non-rubbing relation.

The outer ends of the shaft 22 are reduced in diameter as at ill for receiving thereon one corner portion of the corresponding triangularly shaped side frame chassis members 32, it being under- I stood that the chassis members 32 are identical in construction except that they are right and left hand. Preferably'a-spacer- 33 is interposed between the outer ends of the rollers" and the frame side members 32.

The outer face of each side frame member 32 surrounding the corresponding reduced end 30 of the shaft 221s recessed on its outer face for 7 reception of a nut member II which is threaded onto the outer end of each portion 3| so as to draw the shoulder formed at the junction of the l portion a with the mambodvof theshaft 22 thus caused to form a rigid tie bar between opposite side frame members 32 and aids in making the chassis construction more rigid. A gear casing member 34,, which will hereinafter be described in greater detail, abuts against the outer face of each frame side member 32 and is pivotally secured relative thereto by means of a shouldered stud 36 which is threaded into the corresponding end of the shaft 22 axially thereof. The shoulder on the stud 36 in engaging the corresponding outer end of the shaft 22 insures the proper degree of clearance between the head of the stud'36 and the corresponding member 32 to permit the required pivotal movement of the member 34 and yet prevent looseness in the connection between them. v

As particularly noted in Figs. 2 and 4, a tie bar- 38 is'extended between the front corners of the chassis frame side members 32 and is rigidly secured thereto as by nuts 48 (see Figs. '1 and 8). Thus the shaft 22 and tie bar 38, together with the cutter blade adjusting mechanism which will 1 hereinafter be described in detail, rigidly secure the chassis frame side members 32 together "in spaced relation to form a chassis for the cutter reel, cutter bar and other elements of the mower.

As best illustrated in Fig. 4, each chassis frame side member 32 is provided with an inwardly extending sleeve-like boss 42 within which is preferably received an outer bearing liner 43 in which a bearing 44 is in turn received, and while in the broader aspects of the present invention this bearing construction may be of any suitable or improved type, the particular type shown is of the type commonly known as a floating sleeve bearing in which the member 44 is rotatable both in theliner 43 and about the shaft which is received in it. This type of bearing insures against frequent adjustment, against localized wear, and cone tributes toward maintaining proper alignment of the supported parts. Extending between and rotatably supported in the bearings 44 is the shaft, 46 of the .cutter reel which comprises an elongated hub portion 48 keyed to the shaft 46 by suitable keys 41 fixed against movement axially of the shaft 46 and relative to which the hub 48 of the cutter reel is slidable, permitting relative axial sliding movement between them and having a plurality. of axially spaced discs or sp ders 53 about the peripheries of which are suitably grouped and secured a plurality of cutters 52. Theends of the hub portion 48 are enlarged to form axially concentric pockets 54 therein within the outer end of each of which the corresponding inner end of the bearing boss 42 is received and a suitable packing member 56 is provided between the opposed walls of the sleeve 42 and pocket 54 to prevent the entrance of dirt and dust or other foreign matter to the bearings 44 and to serve as an oil retainer.

Again referring to Fig. 4, it will be noted that in the left hand pocket 54 a ring 58 of hard metal surrounds the shaft 46 in the bottom of the pocket and a ring member 68 also surrounds the shaft 46 in the pocket 54 and is secured against rotation to the end of the corresponding sleeve 42. The ring 68 is of non-uniform thickness, preferably thin at one side and gradually increasing in thickness toward the diametrically opposite side, thus forming a cam. A ball 62. is interposed between the ring 58 and the cam 68.

The opposite end of the hub 48 is provided with a pocket 64 similar to the pocket 54 and within the pocket 64 is a coil spring 66 maintained under axial compression between the bottom of the pocket 64 and the corresponding end of the corresponding sleeve-like boss 42. With this construction it will be apparent that the spring 66 will normally urge the cutter reel to the left, as viewed in Fig. 4, so as to assist the thrust of the cutting action on the reel in causing the ball 62 to be frictionally gripped between the ring 58 and cam 68. Asthe cutter reel rotates the ball 62 will be caused to roll around the .shaft 46 between the ring 58 and cam 68 and at half the speed of the cutter reel, and in rolling it will climb up and down the surface'o'f the cam 68 and will force the entire cutter reel assembly toing operation of the lawn mower it is caused to have a bodily axial shifting movement first in one direction and then the other. This axial movement of the cutter reel not only enhances the cutting effect of the lawn mower in that a more nearly true shaving effect on the grass being cut. thereby is obtained, but the cutters in contactingwith the cutter bar and having bothlaxial and transverse movement with respect to the cutter bar will have a self-sharpening effect on both the blades and the cutter bar. Also, it will be apparent that each point on the cutting edge of the cutters 52 will be brought into contact with different points on the cutter bar, during operation of the lawn mower and thus act to evenly distribute the wear between them rather than to localize it as in conventional constructions where the same points on the cutter contact with the same points on the cutter bar during each revolution of'the cutting reel.

to the axis of the shaft 46 for the cutting reel;

The tip 88 is preferably formed from a piece of high speed or other alloy steel or other suitable material of hard and tough nature which will readily resist wear and maintain its sharpness,

I and may be secured in place by welding, brazing,

or the like.

An arm 82 is received on each end of the shaft- 12 between the corresponding frame side member 32 and the corresponding end of the cutter bar 18 and is secured against rotation on the shaft 12 by' means of a pin 84. A third arm 86 located midway between the arms 82 may be formed integrally with or welded to the cutter bar 18. The arms 82 and 86 extendupwardly from the cutter bar 18 and at their upper ends each is provided with a head 88 provided with an opening 98 therein, the openings 98 being axially aligned with each other. Opposed faces. of the heads 88 are shouldered as at 92 for piloting and forming" abutments for tubes- 94 which extend v right hand arm 82 and which will be described in detail later. Extending through the tubes 94 and openings 90 and between opposite frame side members 32 is a shaft 96 the ends of which are rotatably received in the frame side members 32 and cooperate with nuts 98 to further serve to tie the frame side members 32 against separation with respect to each other.

It might be noted at this point that the frame side members 32 at their point of reception of the ends of the shaft 96 are each provided with an inwardly extending boss I concentric with the axis of the shaft 96 and upon which bosses I00 the inner end members I02 of the handle I04 for the lawn mower are journaled. A washer I05 surrounding the shaft 96 between each boss I00 and the head of the adjacent arm 82 serves to maintain the ends I02 against axial displacement on the bosses I00.

As best illustrated in Figs. 2 and 3, the shaft 96 has'an eccentric I06 fixed thereto within each of the openings 90 of the head 88 and arranged for engagement with the walls of the openings 90. As best illustrated in Fig. 3, the right hand end of the right hand tube 94 instead of being piloted directly upon the corresponding head 88 of the corresponding arm 82, is piloted upon a nut member I08 surrounding the shaft 96 in freely spaced relation thereto. Another member I I0 surrounds the shaft 96 between the nut member I08 and the right hand arm 82 as viewed in Fig. 3 and is piloted directly upon the shoulder 92 of the head 88 of the right hand arm 82. The member H0 is formed for threaded engagement with the nut member I 08 and is also fixed for equal rotation with the shaft 96 by means of a suitable pin H2. As indicated in Fig. 6, the shaft 96 has ample clearance in the member II 0 and the pin 2 has ample clearance in the slots H3 provided for it so as to permit the necessary bodily shifting movement between these parts in the adjustment of the cutter bar. As illustrated in Fig. 4, the exterior surfaces of the members I08 and H0 are knurled to facilitate manual engagement andoperation thereof.

With the above described construction it will be apparent that the axes of the shafts I2 and 96 being fixed with respect to the side frame members 32, rotation of the shaft 96 will cause the eccentrics I06 to bear against the walls of the corresponding openings 90 and cause all of the arms 82 and 86 to be rocked about the axis of the shaft 12 accordingly. As the shaft 12 is thus caused to rock about its axis through movement of the upper ends of the arms 82 and 86, the cutting edgeof the cutter bar I0 will be caused to be moved vertically so as to alter its relation with respect to the path of travel of the cutting edges of the cutters 52. In this manner the clearance between the cutters andthe cutter bar is controlled. In view of the fact that rotation of the member IIO will cause equal rotation of the shaft 96, it provides a means whereby a single member is operable to simultaneously and positively control the clearance between the cutter.

bar. and cutters over the full length of the cutter .bar. against inadvertent movement during adjustment as above described, a spring washer H5 is placed around the shaft 12 between each frame side member 32 and the adjacent levers 82, the parts being so proportioned as to place the washers II5 under compression and effect a frictional thrust means.

In thus adjusting the cutter bar 10 in order to In order to hold the cutter bar assembly vary the clearance between its cutting edge 80 and the cutters 52, the nut I08 is threaded upon the member IIO so as to move it axially toward the member I I0.' The member H0 is then grasped by the hand and rotated until the desired clearance between the cutter bar and the cutters is obtained and then while the member H0 is maintained against rotationthe nut member I08 is threaded so as to move it axially away from the member IIO. This movement of the nut member I08 also tends to move the tubes 94 to the left away from the member I I0 and thereby acts to force the heads 88 of the arms 82 axially of the shaft 96 away from each other and into end clamping engagement with the frame side members 32 through the washers I05. This effectively locks the member I I0 and consequently the shaft 96 and cutter bar I0 against inad- A vertent displacement once the clearance has been adjusted between the cutter bar andthe cutter reel. Referring now to Figs. 3 and 4 and particularly the latter figure, it will be noted that the gear housing members 34 which, as previously described, are mounted for pivotal movement with respect to the axis of the shaft 22 independently wheel, the outer edges of the housings 34 and I20 matching each other and the housings being secured together by means of screws I22. Each housing member I20 is centrally formed to provide a hub I24 wi'thinwhich is preferably received a suitable liner I25, within which, in turn, is rotatably received a bearing I26. Although this bearing construction may be of any suitable type, it is here shown as the floating sleeve type previously described. Rotatably received within each bearing I26 is a wheel hub member indicated generally at I28 and the axial line of which, as will be noted, is approximately vertically aligned with the cutting edge 80 of the cutter bar 10 when the various parts of the mower are in the position indicated in Fig. 2. As illustrated in Fig. 4, the inner end of the hub I28 is recessed to receive a bearing I30, and is provided with a peripheral flange I32 which abuts against the ,axially outer end of the hub I24, and a stud are preferably provided for preventing accidental loosening of the nuts I 40 comprising a washer I42 interposed between each nut I40 and the outer face of corresponding driving wheel I38, the washer I 42 having a pin I 44 projecting into a corresponding opening in the wheel I 38 and the nut I40 being p ovided with notches I46 in its periphery into which a finger I48 on the washer I42 may be bent.

An annular flange I50 is formed on the inner wall of each wheel I 38 concentric with the-opening I36 and relatively closely embraces the pegenerally at I12 andincluding a rim portion ripherally outer surface of the axially outer portion of the hub I24, and a ring I52 of felt or other suitable material is received within a complementary groove within the radially inner face -of the flange I58 so as to serve as an oil retainer and form a seal between the flange I58 -and the hub I24'to prevent the entrance of dirt and dust or. other, foreign material through the joint therebetween. A driving gear I54. is positioned within each gear housing 34=I2l and at its center is provided with an axially outwardly projecting sleeve-like hub I56 rotatably received within the bearing I38. The axialLv outer face of each gear I54 abuts against the axially inner end face of .the corresponding hub I24. Each gear I54 is thus rotatably mounted with respect to its corresponding drivingwheel I38. A pin I58 is relatively closely but rotatably received within the an axially inner end of the gear hub I56 and is provided with a head I68 which overlies the axially inner face of the gear 54-. The pin I58 is reduced in diameter as at I6I and its axially outer end is further reduced as at I62 and threaded 25 axially into the stud I 28 and is secured against hub I 28 as indicated in Fig. 4. The diameter of, the spring I66 is such that its axially' inner end is slightly expanded within the hub I56 of the 0 gear I54 and the direction in" which it is wound is such that when the lawn mower is moved forwardly the frictional engagement between the axially inner end of the spring I66 and the inner surface of the gear hub I56 tends .to uncoil the 45 spring I66 and thus causes the spring to be frictionally expanded into locking engagement with the inner surface of the hub I56, thus locking the corresponding wheel I38 in driving engagement to its corresponding gear I54. If the lawn mower 50 is moved in a backward direction the frictional engagement between the axially inner end of each spring I66 and the inner surface of the corresponding gear hub I56 will tend to contract the diameter of the spring I66 in which event 55 the wheel I38 will overrun or free wheel with respect to the gear I54, and thus no driving engagement between each wheel I88 and its corresponding gear I54 will occur. This same overrunning feature will, of course, occur in connection with the inner wheel of the lawn mower when it isbeing moved over a circular path such as occurs in turning a corner. This form of drive between the driving wheels and the driving gears is not onlysimple and-economical but additionally is 65 substantially noiseless in operation and becomes effective substantially instantaneously regardless of the angular positions of the wheels I38 and their corresponding gears I54, and further provides a resilient clutching effect in connecting the wheels to the cutter reel. 1

Referring now to Fig. 9, it will be noted that each outer gear housing member I28 is internally formed to provide a shoulder I18 concentric with the axis of the wheel and upon which is rotatably 75 received and piloted a spider member indicated I 14, radially disposed arms I16 and a hub portion I18. The hub portion I18 is rotatably received upon a boss I88 formed centrally on the inner face of the inner gear housing member 34 and projecting axially outwardly with respect to the corresponding driving wheel I38 therefrom. At its lower and rearward side each spidermember I12 is provided with a pair of radially outwardly projecting spaced arms I82 between which is rebe driven-at an increased rate of rotation from thegear I54. The shaft 46 of the cutter reel previously described projects at opposite ends into substantially flush relationship with respect to: the outer face of the correspondingside frame member 32', and such projecting ends are each provided with a gear I92 which lies in mesh with the corresponding gear I88. Each gear I 82 is provided with a stub shaft section threaded into the corresponding outer end of the shaft 46 in the same manner as will hereinafter be described in shiftable relative to the axis of the driving wheels I38 in order to adjust the height of cut, it will be apparent that special means must be provided for maintaining the driving engagement between the gear cluster comprising the gears I86 and I88 and the gear I54 bodily fixed with respect to the driving wheels I38 on the one hand and the'gears' for insuring this proper driving engagement is as follows. It will be noted that the stub shafts I84 carrying the gears I86 and I88 are maintained at the proper distance. from the axis of the gear. I54 by means of the spiders I12 previously described and, accordingly, proper mesh ofthe gears I86 and the gears I54 is always assured. As best indicated in Fig. 8, the end wall of each gear housing member 34 is cut away toform an opening 288 therein and it is through these openings that the opposite ends of the cutter reel shaft 46 project into the gear housings 34-I28. The axial y inner end of each of the stub shafts I84 is extended axially inwardly through the corresponding openings 288 and-into sliding engagement with a described, if the chassis frame is shifted relative to the axis of the driving wheels, the spider I'I2 will maintain the proper meshing engagement between the gears I 86 and I54 and the ends of the shafts I84 in 'beingmoved by engagement' with the walls of the cam slots 202 will maintain the proper meshing engagement between the gears I88 and I92. For instance, referring to Fig. 8, the'shafts 46 and I84 and the cam slot 202 are shown in full line in one position of adjust.- ment of the chassis frame, and therefore the cutter reel withrespect to the driving wheels, and are shown in dotted lines; in a different position of adjustment in which the cutter reel is elevated with respect to the: position shown in full line. In such case it will be noted that the cutter reel shaft 46 has moved upwardly'in. the slot 200 about the axis of the fulcrum roll 20 as has also the slot 202. The shaft I84 during this movement has been moved from the lower end of the slot 282 a sufficient distance toward the upper end thereof to maintain the proper driving engagement between the gears I 88 and I92.

With the above described construction the chassis may be pivoted about the axis of the fulcrum roll 20 independently of the driving wheels I38 in order to adjust the height of cut,

and proper meshing engagement of the various gears in the train between the cutter reel and the driving wheels assured at all times.

From the foregoing it will be understood that each driving wheel and gear housing together with the gears contained therein and exeepting the gear I82 on the corresponding and of the cutter reel shaft 46 only, forms a unitary assembly that may be applied to and removed from the mower assembly simply byapplication to or removal of the stud 36 and the corresponding adjusting hand nut. which will hereinafter be described, and which is provided for locking each of these units in pivotally adjusted relation with respect to the chassis frame. Ihe gear I92 may also be removed as previously described so as to leave the outer face of the corresponding side frame member 32 entirely free of obstructions in such case. This feature permits ready removal of one of these units when it is desired to use the mower'for edging purposes along the side of a building or other object without otherwise afiecting its proper functioning.

In order to secure the chassis frame in ad- .iusted position with respect to the driving wheels, the following mechanism is provided. Referring particularly to Figs. 3, 5 and 8, it will be noted that a stud 2III is threaded into each of the gear housing members 34 adjacent the upper edge thereof and projects axially inwardly there-' from in axially parallel relation with respect to the axis of the cutter reel.- .-As indicated in Fig. 8, the corresponding frame side member 34 is provided with a slot 2I2 through'which the corresponding'stud'2l0 projects, the slot 2I2-being of arcuate formation with the axis of the fulcrum rolls 20 as a center.

Referring particularly to Fig. 2, it will be noted that the inner face of each frame side member 34 surrounding the corresponding slot 2I2 is slightly raised as at 2l4 and that this raised portion'is provided with a plurality of angularly spaced pointed axially inwardly extending projections 2I6 arranged in radial relation with respect toith axis of the fulcrum roll 20. Referring now to Figs. 3 and 5, it will be noted that an'inwardly opening cup-shaped washer member 2I8 surrounds each of the studs 2I0 and each 7 is provided with a pair of outwardly extending tongues 220 which project into the corresponding slot 2I2 and prevent relative rotation of the washer 2I8 with respect to the side frame 32. It will also be noted that the bottom of the cupshaped washer is provided with a pair of diametrically oppositely inwardly struck V portionsis threaded upon the inner end of each of the studs 2 I0, and the hollow end portion 226 thereof cooperates with the corresponding washer 2I8 to form a housing within which is received a coil spring 228 maintained under axial compression between the washer 2I8 and the end wall of the hollow portion 226.

With the above described construction when the nut members 224 are tightened down on their corresponding studs 2I8 and the portions 222 of the washers 2I8 receive one of the projections 2I6 therein, the chassis frame side members 32 and consequently the chassis with the cutter reel is firmly locked against movement with respect to the gear housings 34I20 and consequently the driving wheels I38. If it is desired to adjust the height of cut of the mower, which of course involves bodily shifting the chassis relative to the driving wheels so as to bring the cutter reel at a point higher with respect to the ground, the members 224 are loosened and relative angular movement is manually caused between the chassis and the wheels, the washer members 2I8 riding up over the projections 2I6 against the force of the springs 228 until the portions 222 of the washers engage the desired projections 2IB corresponding to the' desired height of cut, and then the nut members 224 are tightened to lock the, various parts in this adjusted position.

The above described means of adjustment may be modified as indicated in Figs. 13 and 14 so as to permit simultaneous adjustment of both wheels relative to the chassis frame, whereas in the construction just described the adjustment is made separately, although this may be desirable under certain circumstances.

As indicated in Figs. 13 and 14, the chassis frame side members are provided with slots 230 corresponding to the slots 2I2 previously described. Instead of providing studs such as the studs 2 I0 previously described, a rod 232 is extended between opposite gear housing members '34 through the slots 230 and are provided with nuts 234 within each of the gear housings, thus further acting to tie these parts together and make the construction more rigid. The rod 232 is enlarged as at 236 between its ends and the ends of the enlarged portion are threaded and extend into spaced but adjacent relationship with the corresponding frame side members 32. A curved gear rack member 238 is welded or otherwise suitably secured to the axially.

Gil

' tion of the hand wheel :42 the nuts :46 are threaded axially outwardly on the shaft 232 and acting through the corresponding gear 248 act to clamp the side frame members32 to the corresponding gear housing member 34 axially of the rod 232. It may be noted at this point that the hand nut 224 in the construction shown in Figs. l to 9, in-

clusive, when adjusted toward the upper end of the'slot 2I2, and the shaft 232 in the construction shown in Figs. 13 and 14 act as-stops for the handle I84, when the same is swlmg upwardly into inoperative position. When the nut 224 is adjusted toward the lower end of the slot 2I2, the upper edge of the guard 258, to be described in detail later, acts as such stop. When the handle I64 is in such position as indicated in dotted lines in Fig. 2, the center of gravity of the handle is forwardly of its pivotal point of connection with the frame side members 32 and disposed between the lines of contact of the fulcrum rolls 20 and the driving wheels I38 with the ground or other supporting surface so that it will maintain itself in such position. This considerably facilitates storing of the lawn mower in a minimum of space 5 when not in use. 3 Because of the fact that the cutter reel is positioned further forward than in conventional constructions, it is desirable to provide some means tionally gripping the cross bar 38. Preferably,.

suflicient friction is exerted between the eye 252 and the cross bar 38 to maintain the guard 250 in any desired manually controlled position of rotation with respect to the axis of the cross bar 38. It may be pivoted forwardly in order to expose the parts therebeneath if it is necessary or desirable to obtain access thereto. The curvature of the guard 258 may generally conform to the curvature of the formed edges of the frameside members 32 in the manner indicated in Fi 2 or may take any other suitable shape. Not only will the guard member 258 prevent damage to the.

' cutter reel from inadvertent contact with foreign articles, but, more important, it will permit the lawn mower to be moved under the edges of shrubs, bushes, hedges, and the like without endan'gerlng the branches or leaves of the same being cut off by'the lawn mower. This feature adds to the serviceability of the lawn mower.

In Fig. 10 a modified form of wheel structure is shown, the parts shown in this figure-being identical to the parts previously described and bearing the same numbers with the exception of the wheel itself. As indicated in Fig. 10, the body of the wheel is formed from two sheet metal disclike parts 256 and 258, the part 256 being received on the stud portion I34 of the wheel hub member I28 and secured in place in the same manner as the wheel I38 previously described. The inner member 258 is axially/spaced from the outer member 256 adjacent its axis and is provided. 15 with a central opening which is flanged as at 260 and closely receives the outwardly projecting portion of the hub I24 therein. The members 256 and 258 are brought into contact at a point slightly inwardly spaced from the periphery of the wheel and both members are bent complementary to each other as at 262 at this point so asto nest together and prevent possible shifting of one with respect to the other. A ring 264 of a size to fit into .the curved portion 262 on the outer member 256 is provided with a plurality of circumferentially spaced, axially parallel studs 266 thereon, which studs project through both members 256 and 258 and are each provided with a nut 268 on their axially inner ends. By this means the peripheral portions of themembers 256 and 258 are securely joined together. The' member 258 is provided with an axially bent flange portion 2160f lesser diameter thanthe maximum diameter of the portion 256 and the marginal portion of this flange 210 is radially outwardly bent as at 212 thereby forming a channel between the portion 212 and the peripheral margin of the member 256. Within this channel a tire member 214 is received and axially clamped against relative movement ,to the members 256 and 258. The tire member 214 is preferably peripherally serrated in the manner of conventional lawn mower wheels and may be formed of either metallic or non-metallic material as may be deemed most desirable. This construction provides a cheap and eflicient wheel and one that is not liable .to be easily broken in the same manner as the conventional cast iron wheels.

In Figs. 11 and 12 a modified 'form of--.cutter bar construction is shown and which is partially built up of sheet metal. In these figures those parts identical to those previously described are indicated by the same numerals. As indicated in this construction, the arms 268 which correspondto the arms 82 and 86 previously described instead of being formed initially integral with the cutter bar are formed separately therefrom as by forging or casting and the inner sides of the outermost arms are shouldered as at 282. The cutter bar body 284 is in this case formed from sheet metal bent to the same general cross-sectional configuration as the cutter bar 18 indicated in Fig. 2 and the opposed edges of the sheet are brought together adjacent the cutting edge 286 which may be formed from a piece of high speed or other steel of desirable characteristics if desired. In such case the lower sheet metal wall is allowed to project forwardly beyond the upper wall to provide a'step for receiving the cutting cut out'of the central portion of the sheet to permit insertion of the lower end of the central arm 280 which is welded thereto after being in- .serted in place. In this construction the outerends of the shaft 12 are fixed against rotation in the side frame members 32 and the arms 28!] to which the cutter bar is fixed are rotatable on the shaft 12. This permits the shaft 12 to be employed as an additional tie bar between the 'frameside members 32 and thus aid in making the chassis more rigid. This form of construction offers another means of providing a more economical structure when built in quantity production.

In Figs. 15 and 16 a modification of the previously. described construction is shown for use on cutting greens of golf courses and'other like uses; As indicated in this construction, the drivstruction.

ing wheels in vertical alignment with the cutter bar are dispensed with and are replaced by two relatively large rollers 290 which trail the fulcrum rolls 29. The rollers 290 are journaled in frame members 292 and 294 disposed at opposite sides of the mower and cooperating to form a gear box between them. The inner members 292 are] also journaled on the shaft 22 of the fulcrum roll and project forwardly therefrom as at 296.

The same chassis as previously described including the chassis side frame members 32 is em ployed in this construction and the chassis is angularly adjustable about the axis of the ful-.

crum roll 29.as in the previously described con- In order to obtain the angular adjustment of the chassis about the axis of the fulcrum roll 20 in orderto vary the height of the cut, the inner members 292 are each provided with anupwardly projecting arm portion 298 :through which a bolt 309 projects through the .slot 2l2 in each frame side member 32 and a nut 392 is provided foreach bolt 39!) for clamping these parts together in adjusted relation. In this case the inner members 292;are each provided 'with a slot 3&4 through whichathe, reel shaft 46 'projects at opposite ends, the slot 314 being struck gears 396 forming part of a gear cluster includ-' ing larger gears 308 suitably journaled within the gear casings 292-294. "I'hegears 308 in turn mesh with smaller gears 3| 9 journaled on the outer end of the fulcrum roll shaft 22 and the gears 3H] are formed as part of a cluster including a chain sprocket 3| 2. The outer ends of he cutter reel shaft 46 are-each provided with a sprocket 3M and a chain 3l6 drivingly connects each sprocket 3 l 2 with its corresponding sprocket 3l4. Thus with this construction the chassis frame with the cutter reel may be vertically adjusted without effecting the operability of the drive between the rolls'290 and the cutter reel in any respect whatever. The handle I 04 in this case instead of being secured to the chassis frame side members 32 may be secured in a similar manner to the inner housings 292. A suitable stop'member such as 320 may be provided on each housing member 292 for engagement with the handle I 94 in order to prevent it from pivoting downwardly about its pivotal connection with the members 292 to a point lower than that de-' sired. The construction otherwise is identical to that previously shown and described, the main difference being that in this case the driving rolls'299 are of a length to be withinthe length of the cutter reel and follows the cutter reel so as to roll over grass that has previously been cut and thus does not endanger the bedding down of the grass before it has been cut.

In Fig. 17 a modified form of construction for the cutter reel is shown and is formed primarily from sheet metal parts and tubing, and this figure also indicates a modified form of mounting means for the cutter reel. In this figure the frame side members are illustrated at 339 and as being formed of sheet metal. Each frame side member 339 and inwardly projecting sleeve 332 is secured by welding, the sleeve 332 being so formed as tobe initially'piloted on and accurately lo- 2,091,o7-'? 'cated in position with respect to the'corresponding frame side member 330. Each sleeve 332 is internally provided with a bushing 334 for r0- tatably-supportin'g the corresponding reduced end 336v of the cutter reel. shaft 338 which projects therethrough. The cutter reel itself is provided ;with an elongated and continuous hub portion 349 formed from tubing and the ends of which telescope over the corresponding sleeve 332,

The sleeves 332 are preferably formed from a suitable hard or wear-resisting material and each end of the hub portion 340 is internally provided with a bushing 342 fixed therein which closely receives the corresponding sleeve 332 therein for relative rotation with respect thereto. The spiders I 344 formed of sheet metal are secured at intervals along the length of the hub portion 340 and the cutter blades 346 are secured to suitable lugs 348 formed on the outer end thereof. A hardened washer350 is pressed into the left hand end of the hubportion 349 as viewed in Fig. 17

against a shoulder 352 suitably formed therein.

A cam member 354 is positioned within the same end of the hub portion 340 and secured against rotation to the inner end of the corre-' sponding sleeve member 332, and a ball 356 is positioned between the cam member 342 and washer 352 to effect longitudinal reciprocation of the cutter reel during rotation thereof in the game manner as in the first described construc- Within the opposite end of the hub portion 340 a ring 358 is pressed in surrounding relation with respect to the shaft 338. This ring member is provided with a key-way 360 in which a key 362 fixed to the shaft 338 is. adapted to be slidably -received so as to insure equal rotation of the shaft 338 with the cutter reel and yet provide the longitudinal-reciprocation of the cutter reel as caused ,by the ball 358 and cam 354. A spring 364 maintained under a relatively light compression between the shoulder 366 on the interior of the right hand sleeve member 332 and the' ring 358 constantly urges the cutter reel to the left as viewed in Fig. 17 so as to maintain the cutter reel in this position when the axially directed torque on the cutter reel caused by a grass cutting operation is not effective. this construction the cutter reel is rotatably supp rted on the side frame members 330 independently of the shaft 338 and, in view of the fact that the bearings for rotatably supporting the cutter reelv are of relatively large diameterand will wear but slightly during operation, it will be a relatively simple matter to maintain the proper relation between the cutter blades and the cutter bar for best cutting conditions.

Fig. 17 also illustrates the method preferably employed in all of the previously described con-- structions'for securing the gears to the ends of the cutter reel driving shaft. As illustrated at the left hand end of the view in Fig. 17 the reduced end 336 of the shaft 338 terminates in substantially flush relation with respect to the outer face of the side frame member 330. The gear.

It will be noted that in I driving wheels and the cutter reel as in the gear type of drive previously disclosed, nevertheless it provides an extremely efiicient construction and one that is considerablyv cheaper to manufacture.

Referring now to Figs. 18 and 19, the fulcrum roll is illustrated at 310, the side frame members at 312 and the driving wheels at 314. The casing for the chain, corresponding to the gear box in the first described construction, comprises parts 316 and 318. The side frame member 312 is connected to the shaft 319 for fulcrum roll 310 in substantially the same manner as first described, that is by a nut 360 threaded on the reduced end thereof and likewise the chain housing 316","318 is pivotally secured to the shaft 319 by a shouldered stud 381, in a manner substantially the same as first described in connection with the gear box 34--l20. The housing member 316 is formed to provide an outwardly. projecting internally hushed hub portion 382\ witliin which is rotatably received a wheel hub member 384 outwardly flanged at its inneren'd for engagement with the inner face of the housing member 316 and provided with a nut 386 on its outer .end for securing the wheels 314 thereto. The wheel 314 is preferably provided with an inwardly projecting ring-like flange 381 internally bushed for bearing upon the outer circumference of the hub 382. A large sprocket 388 is secured to the hub member 394 within the chain housing. Rotatably supported upon the stud 380 in alignment with the axis of the fulcrum roll 310 are a pair of sprockets 390 and 392, respectively, the opposed ends of the hubs of these sprockets being provided with cooperating lugs and notches 394 for releasably connecting them together in driving relation. A chain 396 operatively connects the sprocket 388 and the sprocket 390.

In this modification the outer ends of the cutter reel shaft 391 rotatably support thereon a I sprocket 398 which is drivingly connected with the shaft 391 through a ratchet clutch member including a sliding blade 400 which permits driving of the cutter reel assembly indicated generally at 402 in one direction of rotation only. A. chain 404 drivingly connects '.the sprockets 392 and 398. The outer end of the shaft 396 and the hub of the, sprocket 398 which forms a part of the ratchet mechanism between the sprocket 398 and shaft 396 projects through the plate 318 forming theinner member of the chain 65 housing and, as illustrated in Fig. 18, the plate 70 axis of the fulcrum roll 310 with respectto the chain housing 316-318 in order to adjust the 318 is cut out as at 406 to provide the necessary clearance for these parts, for the hub of the sprocket 392 and for the chain 404 when the frame side members 312 are pivoted about the height of cut. Suitable locking means which may take the form of a bolt 408 fixed with respect' to the plate 318 and projecting inwardly 75 through a slot in each frame side member 312 and provided with a. nut member M2 may be provided for securing the chassis mud chain housing in pivotally adjusted position.

As will be apparent with the above described construction any pivotal movement between the chassis including theyfraime side members 312 and the chain housings 316-318 in order to vary the height of /cut, and which pivotal movement takes place about the axis of the fulcrum roll 318 on which axis the sprockets-390 and 392 rotate, will not affect the proper driving relation between the various sprockets and their chains.

; With this construction, as in the case of the construction first described, one wheel and its chain housing may be removed when it is desired to employ the mowerfor edging purposes and the.

- be incorporated therein if desired, which ,eliminates the axial reciprocation of the cutter reel.

The member 4, which is in the form 01 a fiat or suitably grooved washer, replaces the cam members or 356 of the previously described constructions, and instead of employing a. single ball 62 or 356, a plurality of .balls "6 are positioned between the member 4 and the member 8, which corresponds to'the members 58 and 350 previously described, thus providing aball thrust bearing. This bearing is placed at that end of the mower which resists the axial thrust on the cutter reel caused by the cutting of the grass by. the helically arranged cutting blades of the cutter reel 402. In .view of the fact that the greatest amount of frictional resistance to oper- I ation of the mower in conventional constructions is occasioned by such thrust of the cutter reel, it will be apparent that the above described construction will aid considerably in enhancing the ease of operation of the mower.

From the above description it will be apparent that, particularlywith the construction in Figs. I

1, to 14, inclusive and 18 and 19 because of the fact that the cutting edge of the cutter bar lies in approximately the same vertical plane as the axes of the driving wheels, the mower is capable of cutting at a uniform'hcight regardless of the contour of the surface in the direction in which the mower is being operated and consequently no scalping of the turf will occur as in conventional .lawn mower constructions. Furthermore, by re- .the fulcrum rolls 28 and these will support the mowerin proper position particularly in view of the rigid construction of the chassis. In other words, the rigidity of the construction is such that even with one wheel removed the mower will be operative to cut the grass at a uniform height over the full length of the cutter bar.

It will also be apparent that in all theconstructions shown and described the height of cut may be easily and quickly adjusted and that in the construction illustrated in Figs. 1 to 14, inclusive, and Figs. 18 and 19. in adjusting for the height of the cut the approximately vertically aligned'relation of the cutting edge of the cutter bar and the point of contact of the driving wheels and the ground is substantially unchanged so that the feature of eliminating the 5 po'ssiblity of scufling the turf is present regardless of the adjustment for height of cut. Also that the particular means provided for adjusting the clearance between the cutter bar and the cutting reel provides a quick and convenient manufacture, the construction as a whole lends itself to ease and economy in assembly. While the various parts of the mechanism have for the most part been shown as of cast construction, it will be apparent that it would be within the skill of the ordinary workman versed in the art of forming sheet metal parts to form many of the parts herein shown as of cast construction from sheet metal, so that in quantity production the cost of the device might be considerably reduced thereby.

Formal changes maybe made in the specific embodiment of the invention described without departing from the spirit and substance of the broad invention, the scope of which is commen- 5 surate with the appended claims.

What I claim is:-, Y

1. In a lawn mower, in combination, a fulcrum roll, a driving wheel, a chassis, a cutter reel and a cutter bar carried by said chassis, said driving wheel and said chassis being independently pivotable with respect to each other about the axis of said fulcrum roll, and means drivingly connecting said wheel and said cutter reel.

2. In a lawn mower, in combination, a fulcrum roll, a driving wheel, means including a gear box operatively connecting said driving wheel with respect to said fulcrum roll, a chassis frame pivotable with respect to said means about the axis of said fulcrum roll, a cutter reel and a cutter bar carried by said chassis frame, and means including gearing within said gear box operatively connecting said driving wheel and cutter reel for inter-related movement.

3. In a lawn mower, in combination, a chassis frame, driving wheels bodily shiftable with respect thereto, a cutter reel and a cutter bar mounted in said chassis frame, a gear for driving said cutter reel arranged for equal shifting move ment therewith, a gear bodily movable with said driving wheel with respect to said chassis frame,

gearing connecting the first two mentioned gears, and means for maintaining said gearing in meshing relationship with said two first mentioned gears during bodily shiftable movement between said driving wheel and said chassis frame.

4. In a lawn mower, in combination, a fulcrum roll, a chassis frame, a cutter reel and a cutter bar supported by 'saidchas'sis frame, a driving wheel, means interposed between said driving wheel and said fulcrum roll for maintaining them in spaced relation; means pivotally asso ated with respect to the first mentioned means and connected with said chassis frame permitting inde- 7 pendent pivotal movement between said chassis frame and said driving wheel to vary the height of cut of said mower, and means for securing said means in pivotally adjusted relationship with respect to each other. i

5. In a lawn mower, in combination, a pair of side frame members, means interconnecting said members, a cutter reel and a cutter bar carried between said members, a fulcrum roll rotatably mounted between said members, an element associated with each end of said fulcrum roll for pivotal movement with respect to the axis thereof independently of saidframe side members, a driving wheel carried by each of said elements, and means interconnecting said driving wheels and said cutter reel.

6. In a lawn mower, in combination, a cutter reel, means for rotating said cutter reel, and means for automatically effecting axial reciprocation of said cutter reetduring rotation thereof.

7. In a lawn mower, in combination, a frame;

ing axial reciprocation of said cutter reel in normally timed relation to the rotation thereof duriing and by reason of rotation thereof.

9. In a lawn mower, in combination, a'supporting frame, a cutter reel rotatably and axially slidably supported by said frame, means for rotating said cutter reel, and cam means cooperating between said cutter reel and said frame for effecting axial movement of said cutter reel during and by reason of rotation thereof. r

10. In a lawn mower, in combination, a supporting frame, a cutter reel rotatably and axially slidably supported by said frame, means for rotating said cutter reel, means for positively moving said cutter reel in one axial direction during and by reason of rotation thereof, and yieldable means for moving said cutter reel in the opposite axial direction during rotation thereof.

11. In a lawn mower, in combination, a supporting frame, a cutter reel rotatably and axially slidably supported by said frame, means interconnected between said cutter reel and said frame intermittently and positively moving said cutter reel in one direction axially thereof during and by reason of rotation thereof and spring means opposing the action of the first mentioned means.

12. In a lawn mower, in combination, a sup-,

porting frame member, a cutter reel member rotatably and axially slidably supported by said frame, 43am means interposed between an axial face of said cutter reel member and said frame member, and a rolling anti-friction means interposed between said cam means and one of said members.

13. In a lawn mower, in combination, a supporting frame having a hub, a cutter reel rotatably and axially slidably supported by said'frame, means for rotating said cutter reel, a recessed hub portion on said cutter reel receiving an end of said hub on said frame, a cam member fixed to one of said hubs within said recessed hub, and a ball interposed between said cam memberv and an axially directed face ofthe other of said hubs,

s aoeikm' and spring means constantly urging said cutter reel in one direction of movement axially thereof.

'14. In a lawn mower, iii-combination, a chassis frame, a cutter reel-rotatably supported thereby,

5 a gear for driving said cutter reel and secured to the shaft thereof, a. wheel support pivotally mounted with respect to saidchassis frame, a wheel rotatably supported by said wheel supmounted with respect to said chassis frame, a

wheel rotatably supported by'said wheel support,

a gear carried by said wheel support and driven by said wheel, a spider member rotatablymount- 25 ed on said wheel support, a gear cluster rotatably mounted in said spider member and including two gears one of which is in mesh with saidgear driven by said wheel and the other of which lies in mesh with said gear on said cutter reel shaft, and cam means for controlling the rotational position of'said spider with respect to said wheel support during relative pivotal movement between said chassisframeand said wheel support.

16. In a lawn mower, in combination, a chassis frame, a hollow wheel support forming a gear box pivotally mounted with respect to said chassis frame, a wheel rotatably supported by said wheel support, a gear within said wheel supportcon-- centric with said wheel and( driven therefrom, 40 a gear within said wheel support concentric with said cutter reel andsecured relative thereto for equal rotational movement therewith, a spider member within said wheel support rotatably mounted with respect to the, axis thereof, apin carried by said spider member in axially parallel' but spaced relation with respect to the axis of said wheel, a gearcluster comprising a pair of gears rotatably mounted on said pin, one gear 50 of said gear cluster meshing with said-gear driven by said'whcel andthe other gear of said'gear cluster meshing with said gear fixed with respect to said cutter reel, said chassis having a cam surface formed thereon, and said pin projecting through'said gear housing and into operative engagement with said cam surface'wherebyto be guided thereby during relative pivotal movement between said chassis frame and said wheel supby said frame, a wheel support pivotally mounted with respect to said frame at either end thereof,

a wheel carried by each of said wheel supports in (35 such relation to the pivotal axis thereofthat the axes of said wheels and cutter reel are in approximately the same vertical plane when adjusted to at least one normal cutting position, means drivingly connecting each of said wheels 70 to the corresponding end of said cutter reel, and

means co-acting between each of said wheel supports and said frame so constructedand arranged as to permit the pivotal relationship of one of said wheel supports with respect to said frame 75 to be adjusted independently of the other thereof.-

' port, a gear carried by said wheel support and driven by said wheel, a spider'member rotatablyto said frame.

21. In a lawn mower, in combination, a chassis 17-. In a lawnmower in combination, a chassis frame, a cutter reel and a cutter bar carried Iii. a lawn mower, in-combination, a chassis frame, a utter reel and acutter bar carried by i saidframeiya wheel supportpivotally mounted with respect tosaid frame at either end thereof, a wheel carried by each of said wheel supports,

means drivinglyconnecting each of said'wheels to the corresponding end of said cutter reel, and

means interconnected between said frame and both of said wheel supports for effecting simultaneous pivotal adjustment of said wheel supports with respect to said frame. v

19. In a lawn mower, in combination, a chassis frame, a cutter reel and a cutter bar carried by said frame, a wheel support-pivotally mounted .with respect to said frame at either end thereof,

a wheel carried by each of saidwheel supports, means drivingly connecting each of said wheels to the corresponding end of said cutter reel, and means interconnected between said frame and both of said wheel supports for eifecting simultaneous pivotal adjustment of said wheel supports with respect to said frame comprising racks on said frame, a rotatable shaft interconnecting said wheel supports, and gears rotatable with said shaft and lying in mesh with said racks.

, 20. In a lawn mower, in combination, a chassis frame, a cutter reel and a cutter bar carried by saidframe, a wheel support pivotally mounted with respect to said frame at either end thereof, a wheel carried by, each of said wheel supports, means drivingly connecting each of said wheels to thecorresponding end of: said cutter real, and means interconnected between said frame and both of said wheel supports for effecting simultaneous pivotal adjustment of said wheel supports with respect to said frame comj prising racks on" said frame, a rotatable shaft interconnectingsaid wheel supports, gears rotatable with saidshaft and'lying inmesh with said racks, and means cooperating between said shaft andsaid frame for locking said wheel supports in pivotally adjusted relation with respect frame having side members, a cutter reel and a cutter bar supported by said frame, a fulcrum roll supported between said side members, wheel supports mounted'at each end of. said frame to pivot about the axis of said fulcrum roll relative to said frame, wheels carried by said wheel supports, means operatively interconnected to said wheels with said cutter reel, said side members each having a slot therethrough having a center approximately coincident with the axis of said fulcrum roll,- a screw member anchoredvto each of said wheel supports and projecting through the corresponding of said slots, and

means associatedwith each of said screw members for clamping said wheel supports to said side members. r

22. In a lawn mower, in combination, a chassis frame having side members, a cutterreel and a cutter-bar supported by said frame, a fulcrum roll supported between said side members, wheel supports mounted at each end of said frame to pivot about the axis of said fulcrum roll relative to said frame, wheels carried by said wheel supports, means operatively interconnected to said wheels with said cutter reel, said side members each having a slot therethrough having a center approximately coincident with the axis of said fulcrum roll, a stud fixed to each of saidwheel supports and projecting through the corresponding of said slots, a plurality of angularly spaced, inwardly extending projections on each of saidside of said studs and having a, portion projecting into the corresponding of said slots to prevent rotation of said washer member, each of said washer members having a depression therein adapted for complementary engagement with one of said projections, a nut member threaded on each of said studs and adapted to clamp the corresponding of said-washers between it and the corresponding of said side members, and spring means interposed between each of said nut membersin the corresponding of said washers.

23. In a lawnmower, in combination, a frame including side members and a rod interconnected between them, a cutter reel rotatably supported by said frame, and a sheet metal guard member pivotally mounted on said rod and movable'pto forwardly protecting relation with respect to said cutter reel.

24. In a, lawn mower, in combination; a chassis frame, a cutter reel and a cutter bar supported thereby, a wheel supporting member pivotaliy secured at each end of said chassisframe, a wheel rotatably carried by each.of said wheel supporting members, means for locking said wheelsupports in pivotaliy adjusted relation with respect to said frame, and a handle pivotally secured to said frame, said handle being so con- 0 structed and arranged that when it is moved to its forwardmost position it may engage said means to maintain it in such position.

25. In a lawn mower, in combination, a frame including side members each having an inwardly 5 projecting boss, a shaft extending between and rotatably supported in said bosses, a cutter reel having a hub supported on said shaft, said outter reel hub being so constructed and arranged that its end portions. extend over said bosses in 40 telescoping relation with respect-thereto, said hubs each having an internal annual groove therein and a resilient sealing element received in said groove and bearing on the corresponding of said bosses. 26. In a lawn mower,.in combination, a frame having side members, .a cutter reel rotatably mounted between said side members, a cutter bar pivotally' mounted between said side members and having acutting edge operatively associated with cutter reel, a rod extending between said side members above said cutter bar, a plurality of cam members fixed to said rod, arms fixed to said cutter bar and extending into cooperative relation with respect to said cam members and cooperating therewith whereby rotation of said rod and cam effects pivotal movement of said cutter bar.

27. In a lawn mower, in combination, a frame having a pair of side members, a cutter reel rotatably mounted between said side members, a cutter bar pivotally mounted between said side members and having a cutting edge, cooperable with said cutter reel, a plurality of upwardly extending arms fixed to said cutter bar, the upd5 per ends of said arms having openings therein aligned with each other,a rod extending between and rotatably .received by said side members and extending through said openings, a cam .member' fixed to said rod within each of said openings, and compression means extending between said arms and including axially adjustable means for causing certain of said arms to be clamped against said side members.

l 28. A cutter bar for lawn mowers and'the like including, in combination, a shaft, a sheet metal housing inclosing said shaft, edge portions of opposite walls of said housing contacting each other in oifset relation to form a step, and a hard metal cutting edge received in said step and secured to said, housing. q

29. A wheel for lawn mowers orthe like including a body portion formed to provide two disc-like sheet metal parts axially spaced from one another adjacent their centers and contactingone another adjacent" their periphery, the, peripheral margins of said members cooperating to form a channel between them, a serrated rim received and axially clamped in said channel, and means for maintaining said portions in rimclamping relation.

30. A driving wheel for lawn mowers and the like including a body portion formed of a pair of sheet metal disc-like parts axially spaced from each other adjacent their centers and contacting one another adjacent their peripheries, the peripheral portions of said parts being constructed and arranged to form a channel between them, a serrated rim received in and axially clamped in said channel, said parts being complementarily formed to provide a circular depression therein concentric with the axis thereof, a. ring seated in said depression, studs fixed to said ring and' projecting through said parts, and nuts threaded on said studs and clamping said parts together in assembled relationship.

31. In a lawn mower, in combination, a driving wheel assembly, a member mounted at each end of said assembly and projecting forwardly therefrom, a fulcrum roll'extending between said members in advance of said driving wheel assembly, a chassis frame including side frame members, a cutter reel and a cutter bar supported between said side frame members, said chassis frame pivotally mounted with respect to the first mentioned membersin advance of said fulcrum roll and about the axis of said fulcrum r'oll, means for securing said chassis frame in pivotaliy adjusted relation with respect to said first mentioned members, and means operatively connecting said driving wheel assembly and said cutter reel.

32. In a lawn mower, in combination, a driving wheel assembly, means rotatable relative to said driving wheel assembly secured to .each side thereof and projecting forwardly therefrom, a fulcrum roll rotatably mounted between said means in advance of said driving wheel assembly,

v a chassis frame including side members, a cutof said fulcrum roll in concentric relation thereto, gearing drivingly connecting each of said gears and said driving wheel assembly, and a chain drivingly connecting each of said sprockets and said cutter reel.

33. In a lawn mower, in combination, a chassis frame, a cutter reel and a cutter bar supported by said chassis frame, a driving wheel, a mem-- ber rotatably mounted with respect to said wheel and pivotaliy secured to said chassis in eccentric relation to said wheel, and means drivingly connecting said drivingwheel and said cutter reel including parts supported bysaid member, said driving wheel, member and parts forming a uni-' tary assemblage applicable to and removable from said lawn mower as such.

34. In a lawn mower, in combination, a chassis frame, a cutter reel'and a cutter bar supported by said chassis frame, a housing, means pivotally securing said housing to said chassis frame, a. drive wheel rotatably mounted on said housing by said chassis frame, a member pivotally mounted with respect to said chassis frame, a drive 20 wheel rotatably supported on said member ineccentric relation with respect to the line of pivot of said member with respect to said chassis frame, a sprocket on said drive wheel, a sprocket on said cutter reel, and a pair of sprockets arranged 25 in driving relation with respect to each other for rotation about the line of pivot of said member with respect tosaid chassis frame, and chains drivingly connecting said sprocket on said wheel with one of said pair of sprockets and a chain 30 connecting said sprocket on said cutter reel with the other of said pair of sprockets.

36. In a lawn mower, in combination, a pair of spaced frame side members, means rigidly connecting saidframe side members, a drive shaft, extending between and rotatably supported by saidframe side members, and; a cutter reel having a hollow axially continuous hub portio surrounding said shaft and drivingly connected thereto.

40 37. In a lawn mower,- in combination, a pair of spaced frame side members, means rigidly connecting said frame side members, a drive shaft extending between and rotatably supported by said frame side members, a cutter reel havin 45 a hollow axially continuous hub portion sur-- rounding said shaft and drivingly connected thereto, and means for supporting said cutterreel on said frame side members independently of said shaft. 50 38. In a'lawn mower, in combination, a pair of spaced frame side members, means rigidly connecting said members together, a sleeve member secured to and projecting inwardly from eachframe side member, said sleeve members being 55 arranged in concentric relation with respect to each other, a shaft extending between'and rotatably supported at opposite ends within said sleeve members, a cutter reel, a hollow hub memher for said-cutter reel extending between said 60 sleeve and rotatably supported upon theexterior thereof, and means drivingly connecting said cut- -ter reel and said shaft. i

39. In a lawn mower, in combination, a pair of spaced frame side members, a cutter reel ro- 65 tatably supported between said side members, a\

shaft extending between and supported by said' side members, a cutter bar surrounding and supported by said shaft in operative relation with respect tosaid reel and movable with respect to shaft in cooperative relation withrespect to said tioned gears and rotatable about a line eccentric 'wheels, a hollow hub on each of said gears, a central pin on each of said wheels projecting said frame. during rotation of said reel, a second shaft extending between and rotatably supported by said side members, a cutter bar fixed to said shaft in cooperative relation with respect to said i reel, and means for locking said shaft and cutter bar in rotatably adjusted position.

41.. In a lawn mower, in. combination, a pair of spaced frame side members, a cutter reel rotat--' ably supported between said side members, a

shaft extending between' and supported by said side members and fixed to said side members whereby to forma tie bar therebetween, a cutter bar surrounding and rotatably supported on said reel, and means for locking said cutter bar in rotatably adjusted position on said shaft.

42. In' a lawn mower driving mechanism, in combination, a pair of members pivotally secured together, a rotatable element carried by each of said members in eccentric relation with respect to the line of pivot between them, a gear drivingly secured in concentricv relation with each .of said elements, a pair of gears drivingly connected together. in concentric relation and in meshing relation with respect to the first two mento both said elements and said line of pivot, and

.means for maintaining the meshing relationship betweensaid gears upon pivotal movement between said members.

I combination, a pair of members pivotally mounted with respect to each other, a rotatable element carried by each of said members in'eccentric relation with respect to the line of pivot between them, a gear drivingly connected to each of said rotatable elements in concentric relation with respect thereto, a gear cluster including a pair of gears in meshing relationship with respect to the first mentioned pair of gears and rotatably mounted in eccentric relation .with .respect to 40 the first mentioned gears and with respect to the line of pivot between'said members, supporting means plvotally mounted with respect to one of said members for pivotally supporting said gear cluster for bodily shiftable movement about the axis of said gear connected to one of said members, guiding means on the other of said members, and means associated with said gear cluster engage-' able with said guiding means for-controlling the pivotal relation of said gear cluster support with respect to the first mentioned member. 44. In a lawn mower, in combination, a fulcrum roll, a pair of driving wheels, means including a gear box operatively connecting said wheels to said roll, a chassisframe pivotally connected to said means for pivotal movement about the axis of said roll, means for locking said frame in pivotally adjusted relation, a gear within each of said boxes concentric with the corresponding of said into the corresponding hub, a coil spring between each said pin and hub forming a one way drive between them, acutter reel shaft rotatably supshaft extending 'betweenopposite sides of said frame, a cutter bar supported at a-plurality of axially spaced points on said shaft for movement about the axis thereof, the cutting edge" of said 75 

